[smokeping-users] Re: Experience with FreeBSD 6.x and Smokeping

Vinny Abello vinny at tellurian.com
Thu Dec 7 17:40:02 MET 2006

I adjusted these parameters... My maxfragpackets was actually at 2048.
Wouldn't the problem be if it's too small, not too large? The
maxfragsperpacket was already at 16.

Edinilson J. Santos wrote:
> You need to adjust some parameters in your sysctl.conf.
> Try something like (in sysctl.conf):
> net.inet.ip.maxfragpackets=40
> net.inet.ip.maxfragsperpacket=16
> and see what happens.
> Regards
> Edinilson
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> ----- Original Message ----- 
> From: "Vinny Abello" <vinny at tellurian.com>
> To: <smokeping-users at list.ee.ethz.ch>
> Sent: Wednesday, December 06, 2006 4:11 PM
> Subject: [smokeping-users] Experience with FreeBSD 6.x and Smokeping
> Are there many people using FreeBSD 6.x and Smokeping?
> I asked this a while back but nobody seemed to have any input. Ever since 
> moving from FreeBSD 5.3 to 6.0 (currently 6.1) I have been seeing artificial 
> loss in smokeping that does not exist. It always shows up as two repeated 
> intervals of 19/20 packets received (light blue) and never at the same time 
> on any of the monitors. I think there is some sort of ICMP rate limiting or 
> something else going on in the kernel but I have never been able to locate 
> it. Users on the FreeBSD-Stable list didn't have any input either. You can 
> clearly see on all of my graphs at the precise time I upgraded from 5.3 to 
> 6.0 there is slight loss from that time forward. It makes the graphs that 
> are logged for long periods of time look bad (always light blue) instead of 
> mostly green which they should be (for my network anyway). I've done 
> numerous tests with other tools to verify there is no packet loss from the 
> same machine. I cannot reproduce the statistics I see with Smokeping using 
> anything else. I'm
>  hoping someone might have some input (other than use Linux). :)
> If you need any more information about my setup, just ask. Almost all probes 
> are Fping based and there are somewhere between 50 and 60 monitors setup. 
> The server is a Dell 2650 with dual P4 Xeon 2.8GHz CPU's. MP kernel is 
> enabled. I was toying with disabling MP to see if it was some sort of weird 
> problem with multiple CPU's.
> Any help or suggestions are appreciated! :)


Vinny Abello
Network Engineer
Server Management
vinny at tellurian.com
(973)300-9211 x 125
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